Guard for woodworking machines



C YOUNG. GUARD FOR WOODWORKING MACHINES.

APPLICATION FILED MAY 2, I919.

Patented Aug. 22, 1922.

lvwwtoz GharlesYoung.

GUARD FOR 'WOOIDWORKING: IMACHINES.

Specifi cation of Le tters Patent.

Patented Avg. 2%, 1922,

Application filed "May 2, 1919. Serial No. 294,201.

T 0 all whom, it may concern Be it known that 1, CHARLES Youne, a 3.1 ofthe United States, residing at Indianapolis, in the county o'l M: "ionand State of Indiana, have invented cert in new and useful improvementsin Guards tor /Voodwor ring Machines, of which the following is aspecification.

My s. 'd invention relates to wood working machines, aarticularly tomachines employing cutter-heads for shaping portions of frame workentering into the construction of such devices as automobile tops, etc.in such machines rotary cuttcr-head mounted on a vertical spindle whichextends through the work table of the machine and the wood member to beshapedis manipulated by hand against the rapidly rotating cutter-headuntil the work is reduced to a finished form. 2

In such machines it is essential that the rotary cutter should be alwaysavailable for instant use on bringing the work into contact therewith.Said rotary cutters, however, present elements of danger to the operatorinasmuch as their cutting edges are unguarded and the hands of theoperator are liable under many conditions to come in contact therewith.

The object of my said invention is to provide aguard for suchcutter-heads, which will normally stand in front of the edge of thecutter at the point of operation but which will be forced back behindits edge when the work isbrought into position to be operated upon andwhich will again automatically return to cover the edge of the cutter assoon as the work is withdrawn, and thereby guard the operator againstaccidentfrom contact with said cutter-head, all as will hereinafter bemore fully described and claimed.

Referring to the accompanying drawing, which is made a part hereof andon which similar reference characters indicate similar reference parts,

Figure 1 is a vertical section through a cutter-head of the typereferred to illustrating my improved guard and means for attaching itthereto, and

Figure 2, a crosssection looking in the direction indicated by thearrows from the dotted line 2-2 in Figure 1.

In said drawings the portions marked A represent the work table of themachine and B the cutter-head spindle, both of which parts are, or maybe, of any approved or desired construction, the spindle B being mountedin appropriate hearings and connected with suitable driving means (notshown), as is usual in this type of machine.

lilounted upon a shoulder 10 on spindle B is a disk 11 having a hubportion adjacent to the spindle, and mounted upon the end of said hubportion of disk 11 is'a disk in which are formed tangential grooves 13in which the cutters 14 are mounted at their lower ends. At the upperend is a similar structure comprising a disk 15, and a disk 1.6 havinggrooves corresponding to the grooves in disk 12 in which the upper endof cutters 14; are mounted. A nut 17 is mounted on the screw-threadedupper end of the spindle and is adapted to clamp said disks and thecutters firmly between the shoulder 10 and said nut.

The disks 12 and 16 are formed recessed and have rings 18 mounted insaid recesses with their outer faces flush with the faces of disks 16and 12. Said rings 18 are held in position by rings 19 formed interiorlyscrew-threaded and adapted to turn onto screw-threaded portions of saiddisks 12 and 16. Ball races are formed between the opposite sides ofsaid rings 18 and the adjacent taces of disks 12 and 16 and rings 19 inwhich ball bearings are mounted, as shown. By this means rings 18, oneat the lower end of the cutter-head and the other at the upper end ofthe cutter-head, are adapted to move independently of the cutterheadstructure.

To said rings 18 is secured a guard 20, in

the form of a semi-cylindrical member, by screws 21. A stop-pin 22 ismounted in the work table adjacent to the cutterhead and a horizontalhook or pin 23 is secured in the guard 21 in position so that when thepin and hook are in contact the forward edge of the guard will havepassedover and in front of the cutting edge of the cutter 1d at thepoint 25 where the work is done.

In operation, the frame member to be shaped, or dressed, is taken by theoperator in his hands, laid upon the work table A and pushed against thefront edge of the guard 20 toward the edge of the knife 14: behind. saidguard. The operation forces the guard backward uncovering the edge ofthe cutting knife and permitting the knife to operate freely upon themember. At each motion of the piece of wood, as the operator manipulatesit back and forth, the guard oscillates on its bearings uncovering theedge of the cutter as the wood member is pushed toward the knife whilethe rotary motion of the cutter-head carries said guard forwardovertheec ge of the knife instantly on the Work being removed from thecutting edge.

By this knife is'always and instantly available for use'in dressingorshaping the wood members but on the other hand is instantly covered toguard against accident when the work is removed. i

Having thus fully described my said invention, what I claim as new anddesire to secure'by Letters Patent, is:

1. In combination, aworlr table, a vertical shaft, a cutter head on theshaft having blades extending down to the-level of the table, asegmental guard for the blades extending over their entire length, saidguard being adapted to be moved out of protect 'ing position byfrictional engagement of the work, and'movable into protecting positionby the rotationof the shaft, substantially as set forth. I

the table, cutting means the cut-ting edge of the" 2. In combination, awork table, a vertical shaft collars fixed-to the shaft, the lowercollar being beneath the upper surface of devices carried by saidcollars, a segmental guard also carried by said collars, and means tomove it between the blades and the operators normal position,substantially as set forth.

3. In combination, a work table, a vertical shaft, collars fixed to theshaft, the lower collar being beneath the upper surface of the table,cutting'blades attached at their ends to the respective collars,'asegmentalguard extending from one collar to the-other, and

movable into guardingposition by rotation 1 ofthe shaft and into contactwith the work forth.

In witness whereof, I have hereunto set my hand and seal atIndianapolis, Indiana this 17th day of April, A. D. nineteenhundred andnineteen.

I CHARLES YOUNG. [Ls] Witnesses: I

E. W. BRADFORD, M. L. \SHULER.

another position by substantially as set

